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View submission: What makes an argument valid?
You got it.
Just remember that the system is designed so that one thing can't happen: we can't have true premises lead to a false conclusion.
That would be really bad, right? We input truth and our system outputs falsity. A system like that would be worthless. So, in our system, that's the one thing that can't happen. Everything else is fine, as far as structure is concerned.
There's nothing here!